Something to mull over, Jones.
"The dual to the Hertzian dipole is our fourth case, a sinusoidally excited current loop. A current loop is characterized by its "moment," which is the product of the current it carries times its amplitude. Looking at figure 2, we see that the electric and magnetic fields for a sinusoidally driven infinitesimal current loop mirror those for the Hertzian dipole. Here, the near field magnetic field exhibits 1/r3 behavior, while the near-field electric strength falls off as 1/r2. In the far field, both E and H exhibit 1/r behavior. Their ratio, which is the wave impedance, is the characteristic impedance of the surrounding medium, just as it is for the Hertzian dipole. "
Force at far = 1/r^2 ??
Frederick
